I had to look up the church where the shit storm happened.
Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site. Its maze of underground passageways are also open to visitors and the fortress bakery (1832) is again in working order.
The fortress is also known by its French name, Citadelle Petersberg, as French troops were stationed there from 1806 to 1814, when Erfurt was under Napoleonic occupation. Napoleon visited Erfurt several times and the citadel was further developed during his rule, although parts of it were damaged in a battle in 1813.
The citadel was built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century.
The former lower barracks (German:Untere Kaserne) building is now used to house and administer archives of the Stasi Records Agency.
Speaking of shit, The Stasi Records Agency (Stasi-Unterlagen-Behörde) is the organisation that administers the archives of Ministry of State Security (Stasi) of the former German Democratic Republic (East Germany). It is a government agency of the Federal Republic of Germany.